Refillable cartridge-fuse.



E. B. MALLO'RY.

REFILLABLE CARTRIDGE FUSE.

APPLICATION FILED 001.3. 1911.

1,092,498. Ratented` Apr. 7, 1914 mlm WITNESSES 1N VENTOR ATTORNEY `As nwAian B. MALLonY, or

' russ e MANUFACTURING co., or rITTs "or NEW Yoan.

WILKINSBURG, PENNSYLVANIA, .ASSIG-NOR T0 ECONOMY BUBGH, PENNSYLVANIA, A. CORPORATION p L:a.er1tiranti; cARTnrneErUsn Speccaton of Letters Patent. Application ined october 3, 1911. serial No. 652,493.

Patented Apr. 7, 1914.

To all whom 'it may concern:

Be it known that I, EDWARD B. MALLORY, a citizen of the United States, residing at Wil-kinsburg, in the county of Allegheny and State of Pennsylvania, have invented a certain new and useful Improvement in Rellable Cartridge-Fuses, of which the following is a specification.

My invention pertains to rellable cartridge fuses of the electrical claand of a type to accommodate currents of high or low capacity, which are capable of being easily recharged when the fuse blows out., and which can be used repeatedly.

The fundamental object of my invention is the provision of a rechargeable cartridge fuse involving first, the elements of good electrical and mechanical contact between the renewable fuse element and securing cap members: second, means for holding the fuse rigidly in position: and third, means for exosing the ends of said Lfuse while under contact with the cap members in order to determine the exact ratable capacity of the fuse, and in addition to determine the manufacturers trade-mark or secret design.

In the accompanying drawing forming a part of thisspecification Figure 1 is a longitudinal sectional view of the assembled fuse: Fig. 2 is a longitudinal sectional view taken at a right angle to that of Fig. 1: Flg. 3 shows end and side views of the exteriorly threaded ends of modified forms of shells: Fig. 4 is the removable fuse element: Fig. 5 shows a face and edge view of one form of washer used at the end of the shell, and Fi 6 is a face and edge view of a modiform of washer. i Throu hout the diierent views shown in the drawing the numeral 1 designates a shell made of any suitable non-conducting' mate-- rial and having the ends thereof threaded exteriorly. Seated at the open ends of the shell are removable washer members 2, which arev designed and perform the function of a contact and securing means for the end sections of the interiorly positioned and removable fuse element 3. It being essential that this fuse element should be retained in fixed relationship with the other members I have show n two means vfor preventing rotary movement ofthe said washers, whereby said fuse will be retained in position.

The first means involves a lug 4 formed on the extreme outer end of the shell, adapb ed to enter a notch 5 in said washer `E2, while the modified form involves a lug 6 carried by said washer which enters a notch 7 formed in the eXtreme outer end of said shell. Either of these two described means are adequate for the purpose intended, and are simple modifications of each other. The fuse element 3 is preferably formed according to the configuration shown in Fig. 4, involving a reduced central portion and enlarged ends, which ends are stamped with the rated capacity of the fuse and likewise with the manufacturers trade-mark .or design. diagonally through the shell Aand the enlarged ends are bent over so as to lie in an Vapproximate plane with said washers, after the adjacent neck or body of said fuse has been passed .through the slot 5 of the one form of washer, or else through the slot 8 provided in the modified form, Fig. 6. As clearly shown in Figs.. 5 and 6, the slots 5 and 8 are disposed on the lines of chords of the washer 2, these chords extending be? tween the ends of the arcs, preferably of about ninety degrees, but in any case considerably less than one hundred and eighty degrees, so that when the' end of the link 3 is bent over the washer 2, an extended con-4 tact area is attained between the end of the link (preferably enlarged, as shown in Fig. 4) and the cap 9, thereby providing a good 4'electrical connection and an even seat for the cap. The washersbeing held against rotary movement by reason of the lug and slotformation said lfuse, when l positioned as heretofore described, will be prevented-from rotating. `When thus assembled the screw cap members 9 are turned on' over the threaded ends of said shell, and upon coming in contact with the enlarged ends of said fuse element,- will insure a positive elec-l trical contact at this point. In order to expose the marked ends of said fuse for proper inspection as to rated capacity, and to guard against fraud in competitive manufacture, I provide the aperture 10 through the outer face of each cap member.l v v During'the iinal process of assembling as the -cap members are being turned on over the ends of the shellr they will come in direct `contact with the bent over ends of the fuse fel'ement. and as. this turning on process is eini'tinued to the maximum limit of move- )ment of isa-id caps, the oxid that. has formed on the said fuse, due to natural atmospheric causes, will be removed b, the frictional engagement of the two sai y elements, thereby brightening saidv fuse at the essential point of engagement, and set up a good electrical contact.

What I claim as my invention is:

lfA refillable cartridge fuse comprising a shell, washers removably lying against and entirely closing the open ends of the shell, each washer having an opening communicatin with the interior of the shell adjacent 't e inner periphery of the latter, a fuse within and extending from end to end of the shell and also throu h the openin s in the respective washers, t e portions o the fuse which lie in the openings in the Washers filling the portions of the openings which communicate with the interior of the shell, and each end of the fuse being provided withv a terminal disposed transversely of the fuse and lying in contact with vthe outer face of the adjacent washer, and caps embracing the fuse terminals and the washers and con-y nected with the shell to hold the terminals and the .Washers in intimate contact.

2. A refillable cartridge fuse' comprising a shell having threaded ends, .washers removably lyin against and entirely closing the open en s of the shell, 'each washer having an opening communicating with the interior of the shell adjacent the inner periphery of the latter, a fuse within and extending from end to end of the shell and through the openin s in the respect-ive washers, each end of t e fuse being provided with an enlarged terminal disposed transversely of the fuse and lying in contact With`the outer face ofthe adjacent washer and of a size substantially equal to that of rthe washer, the openings in the washers being illed by the portions of the fuse which lie in said opening, and caps embracing the terminals and the washers to hold them in intimate contact and also provided with threlads fitting the threaded ends of the shel In testimony whereof, I aiiix my signature in the presence of two Witnesses.

MABEL S. THOMPSON, H. W. STnvENsoN.`

Copies of this patent may 'be obtained for five cents each, by addressing the Commissioner o1' Patents',

Washington, D. C. 

